Disappearing email accounts

I have a client I recently added an account for on Cpanel/WHM. Only issue I am having is, whenever we add his pop emails via Cpanel, after about 15-30 minutes, they simply disappear! I thought he was crazy or doing something wrong so I went in and added them myself, sure enough, about 30 minutes later they just disappear and it shows no POP3 emails setup. Anyone else had this problem? I couldn't find anything searching the forums for "email disappear".

Deron

Deron
http://www.metalages.com

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